// Copyright 2011 David Galles, University of San Francisco. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other materials
// provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those of the
// authors and should not be interpreted as representing official policies, either expressed
// or implied, of the University of San Francisco


function OpenHash(am, w, h) {
    this.init(am, w, h);

}


var POINTER_ARRAY_ELEM_WIDTH = 70;
var POINTER_ARRAY_ELEM_HEIGHT = 30;
var POINTER_ARRAY_ELEM_START_X = 50;

var LINKED_ITEM_HEIGHT = 30;
var LINKED_ITEM_WIDTH = 65;

var LINKED_ITEM_Y_DELTA = 50;
var LINKED_ITEM_POINTER_PERCENT = 0.25;

var MAX_DATA_VALUE = 999;

var HASH_TABLE_SIZE = 13;

var ARRAY_Y_POS = 350;


var INDEX_COLOR = "#0000FF";


OpenHash.prototype = new Hash();
OpenHash.prototype.constructor = OpenHash;
OpenHash.superclass = Hash.prototype;


OpenHash.prototype.init = function (am, w, h) {
    var sc = OpenHash.superclass;
    var fn = sc.init;
    fn.call(this, am, w, h);
    this.nextIndex = 0;
    this.POINTER_ARRAY_ELEM_Y = h - POINTER_ARRAY_ELEM_WIDTH;
    this.setup();
}

OpenHash.prototype.addControls = function () {
    OpenHash.superclass.addControls.call(this);

    // Add new controls

}

OpenHash.prototype.insertElement = function (elem) {
    this.commands = new Array();
    this.cmd("SetText", this.ExplainLabel, "Inserting element: " + String(elem));
    var index = this.doHash(elem);
    var node = new LinkedListNode(elem, this.nextIndex++, 100, 75);
    this.cmd("CreateLinkedList", node.graphicID, elem, LINKED_ITEM_WIDTH, LINKED_ITEM_HEIGHT, 100, 75);
    if (this.hashTableValues[index] != null && this.hashTableValues[index] != undefined) {
        this.cmd("connect", node.graphicID, this.hashTableValues[index].graphicID);
        this.cmd("disconnect", this.hashTableVisual[index], this.hashTableValues[index].graphicID);
    } else {
        this.cmd("SetNull", node.graphicID, 1);
        this.cmd("SetNull", this.hashTableVisual[index], 0);
    }
    this.cmd("connect", this.hashTableVisual[index], node.graphicID);
    node.next = this.hashTableValues[index];
    this.hashTableValues[index] = node;

    this.repositionList(index);

    this.cmd("SetText", this.ExplainLabel, "");

    return this.commands;

}


OpenHash.prototype.repositionList = function (index) {
    var startX = POINTER_ARRAY_ELEM_START_X + index * POINTER_ARRAY_ELEM_WIDTH;
    var startY = this.POINTER_ARRAY_ELEM_Y - LINKED_ITEM_Y_DELTA;
    var tmp = this.hashTableValues[index];
    while (tmp != null) {
        tmp.x = startX;
        tmp.y = startY;
        this.cmd("Move", tmp.graphicID, tmp.x, tmp.y);
        startY = startY - LINKED_ITEM_Y_DELTA;
        tmp = tmp.next;
    }
}


OpenHash.prototype.deleteElement = function (elem) {
    this.commands = new Array();
    this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem);
    var index = this.doHash(elem);
    if (this.hashTableValues[index] == null) {
        this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + "  Element not in table");
        return this.commands;
    }
    this.cmd("SetHighlight", this.hashTableValues[index].graphicID, 1);
    this.cmd("Step");
    this.cmd("SetHighlight", this.hashTableValues[index].graphicID, 0);
    if (this.hashTableValues[index].data == elem) {
        if (this.hashTableValues[index].next != null) {
            this.cmd("Connect", this.hashTableVisual[index], this.hashTableValues[index].next.graphicID);
        } else {
            this.cmd("SetNull", this.hashTableVisual[index], 1);
        }
        this.cmd("Delete", this.hashTableValues[index].graphicID);
        this.hashTableValues[index] = this.hashTableValues[index].next;
        this.repositionList(index);
        return this.commands;
    }
    var tmpPrev = this.hashTableValues[index];
    var tmp = this.hashTableValues[index].next;
    var found = false;
    while (tmp != null && !found) {
        this.cmd("SetHighlight", tmp.graphicID, 1);
        this.cmd("Step");
        this.cmd("SetHighlight", tmp.graphicID, 0);
        if (tmp.data == elem) {
            found = true;
            this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + "  元素已删除");
            if (tmp.next != null) {
                this.cmd("Connect", tmpPrev.graphicID, tmp.next.graphicID);
            } else {
                this.cmd("SetNull", tmpPrev.graphicID, 1);
            }
            tmpPrev.next = tmpPrev.next.next;
            this.cmd("Delete", tmp.graphicID);
            this.repositionList(index);
        } else {
            tmpPrev = tmp;
            tmp = tmp.next;
        }
    }
    if (!found) {
        this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + "  Element not in table");
    }
    return this.commands;

}
OpenHash.prototype.findElement = function (elem) {
    this.commands = new Array();
    this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem);

    var index = this.doHash(elem);
    var compareIndex = this.nextIndex++;
    var found = false;
    var tmp = this.hashTableValues[index];
    this.cmd("CreateLabel", compareIndex, "", 10, 40, 0);
    while (tmp != null && !found) {
        this.cmd("SetHighlight", tmp.graphicID, 1);
        if (tmp.data == elem) {
            this.cmd("SetText", compareIndex, tmp.data + "==" + elem)
            found = true;
        } else {
            this.cmd("SetText", compareIndex, tmp.data + "!=" + elem)
        }
        this.cmd("Step");
        this.cmd("SetHighlight", tmp.graphicID, 0);
        tmp = tmp.next;
    }
    if (found) {
        this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem + "  已找到！")
    } else {
        this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem + "  未找到！")

    }
    this.cmd("Delete", compareIndex);
    this.nextIndex--;
    return this.commands;
}


OpenHash.prototype.setup = function () {
    this.hashTableVisual = new Array(HASH_TABLE_SIZE);
    this.hashTableIndices = new Array(HASH_TABLE_SIZE);
    this.hashTableValues = new Array(HASH_TABLE_SIZE);

    this.indexXPos = new Array(HASH_TABLE_SIZE);
    this.indexYPos = new Array(HASH_TABLE_SIZE);

    this.ExplainLabel = this.nextIndex++;

    this.table_size = HASH_TABLE_SIZE;

    this.commands = [];
    for (var i = 0; i < HASH_TABLE_SIZE; i++) {
        var nextID = this.nextIndex++;

        this.cmd("CreateRectangle", nextID, "", POINTER_ARRAY_ELEM_WIDTH, POINTER_ARRAY_ELEM_HEIGHT, POINTER_ARRAY_ELEM_START_X + i * POINTER_ARRAY_ELEM_WIDTH, this.POINTER_ARRAY_ELEM_Y)
        this.hashTableVisual[i] = nextID;
        this.cmd("SetNull", this.hashTableVisual[i], 1);

        nextID = this.nextIndex++;
        this.hashTableIndices[i] = nextID;
        this.indexXPos[i] = POINTER_ARRAY_ELEM_START_X + i * POINTER_ARRAY_ELEM_WIDTH;
        this.indexYPos[i] = this.POINTER_ARRAY_ELEM_Y + POINTER_ARRAY_ELEM_HEIGHT
        this.hashTableValues[i] = null;

        this.cmd("CreateLabel", nextID, i, this.indexXPos[i], this.indexYPos[i]);
        this.cmd("SetForegroundColor", nextID, INDEX_COLOR);
    }
    this.cmd("CreateLabel", this.ExplainLabel, "", 10, 25, 0);
    this.animationManager.StartNewAnimation(this.commands);
    this.animationManager.skipForward();
    this.animationManager.clearHistory();
    this.resetIndex = this.nextIndex;
}


OpenHash.prototype.resetAll = function () {
    var tmp;
    this.commands = OpenHash.superclass.resetAll.call(this);
    for (var i = 0; i < this.hashTableValues.length; i++) {
        tmp = this.hashTableValues[i];
        if (tmp != null) {
            while (tmp != null) {
                this.cmd("Delete", tmp.graphicID);
                tmp = tmp.next;
            }
            this.hashTableValues[i] = null;
            this.cmd("SetNull", this.hashTableVisual[i], 1);
        }
    }
    return this.commands;
}


// NEED TO OVERRIDE IN PARENT
OpenHash.prototype.reset = function () {
    for (var i = 0; i < this.table_size; i++) {
        this.hashTableValues[i] = null;
    }
    this.nextIndex = this.resetIndex;
    OpenHash.superclass.reset.call(this);
}


OpenHash.prototype.resetCallback = function (event) {

}


/*this.nextIndex = 0;
 this.commands = [];
 this.cmd("CreateLabel", 0, "", 20, 50, 0);
 this.animationManager.StartNewAnimation(this.commands);
 this.animationManager.skipForward();
 this.animationManager.clearHistory(); */


OpenHash.prototype.disableUI = function (event) {
    var sc = OpenHash.superclass;
    var fn = sc.disableUI;
    fn.call(this);
}

OpenHash.prototype.enableUI = function (event) {
    OpenHash.superclass.enableUI.call(this);
}


function LinkedListNode(val, id, initialX, initialY) {
    this.data = val;
    this.graphicID = id;
    this.x = initialX;
    this.y = initialY;
    this.next = null;

}


var currentAlg;

function init() {
    var animManag = initCanvas();
    currentAlg = new OpenHash(animManag, canvas.width, canvas.height);
}
